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Mastering FreeSWITCH

You're reading from  Mastering FreeSWITCH

Product type Book
Published in Jul 2016
Publisher Packt
ISBN-13 9781784398880
Pages 300 pages
Edition 1st Edition
Languages
Concepts
Authors (8):
Russell Treleaven Russell Treleaven
Profile icon Russell Treleaven
Seven Du Seven Du
Profile icon Seven Du
Darren Schreiber Darren Schreiber
Profile icon Darren Schreiber
Ken Rice Ken Rice
Profile icon Ken Rice
Mike Jerris Mike Jerris
Profile icon Mike Jerris
Kalyani Kulkarni Kalyani Kulkarni
Profile icon Kalyani Kulkarni
Florent Krieg Florent Krieg
Profile icon Florent Krieg
Charles Bujold Charles Bujold
Profile icon Charles Bujold
View More author details
Toc

Table of Contents (21) Chapters close

Mastering FreeSWITCH
Credits
About the Authors
About the Reviewers
Contributors
www.PacktPub.com
Preface
1. Typical Voice Uses for FreeSWITCH 2. Deploying FreeSWITCH 3. ITSP and Voice Codecs Optimization 4. VoIP Security 5. Audio File and Streaming Formats, Music on Hold, Recording Calls 6. PSTN and TDM 7. WebRTC and Mod_Verto 8. Audio and Video Conferencing 9. Faxing and T38 10. Advanced IVR with Lua 11. Write Your FreeSWITCH Module in C 12. Tracing and Debugging VoIP 13. Homer, Monitoring and Troubleshooting Your Communication Platform Index

What is Fax over IP?


Fax over IP (FoIP) is not the scanning of an image and transmission of the results to a remote end via the Internet. That would be e-mailing (the resulting TIFF file), or FTPing it, or sending the file via HTTP PUT. Or whatever. No, that would be very easy; the Internet was born for it, but that is not faxing.

Fax over IP is actually to interact via the Internet with a remote, regular (T30, PSTN) fax machine. The problem is, to exactly reproduce the characteristics of a PSTN electrical circuit via a packet network is almost impossible. Packets get delayed, they arrive out-of-order (for example, the third packet arrives after the fifth), they get lost (for example, the fourth and seventh packets do not arrive at all), delays are not constant as a transmission proceeds (for example, jitter), and so on. All of this is not a problem for file transfer protocols like HTTP, and is a minor nuisance for voice transmission (both software correction and the human ear are very adaptable...

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